E-Mail

What any Special?Electronic mail, most commonly referred to as email or e-mail is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the same time, in common with instant messaging. Today's email systems are based on a store-and-forward model

eMail protocolsSMTP ~ POP ~ IMAP

SMTPSimple Mail Transfer Protocol is an Internet

standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks. 

POPIn computing, the Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection.

Last version: POP3

IMAPThe Internet Message Access Protocol (commonly known as IMAP) is an Application Layer Internet protocol that allows an e-mail client to

access e-mail on a remote mail server.

Last version: IMAP4

What about “@” mark?

The story of send

Google’s cloud servers

Google’s cloud servers